From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Radiator performance tests on Chassis No. 22 G V, recording water temperatures under various conditions.
| Identifier | ExFiles\Box 155\1\ scan0197 | |
| Date | 31th May 1936 | |
| CHASSIS NO. 22 G V.{VIENNA} 31.5.36. Radiator Tests Continued. 4. Spring was fitted in thermostat, and test continued with empty header tank at max. speed. Air 16°c. WATER IN ENGINE | WATER IN RADIATOR | DIFFERENCE | SHUTTER POSITION. 71°c. | 65°c. | 6°c. | Closed. 75 | 70 | 5 | " 82 | 80 | 2 | " 88 | 85 | 3 | " Shutters begin to open 95 | 87 | 8 | Half open 91 | 85 | 6 | " " 88 | 80 | 8 | " " 88 | 80 | 8 | " " 88 | 80 | 8 | " " FLUCTUATING 92/90/93 | 84 | 8 | " " 89 | 81 | 8 | " " Average 86°c. | 79.7°c. | 6.3°c. | 5. Last test was repeated with header tank nearly full. WATER IN ENGINE | WATER IN RADIATOR | DIFFERENCE | SHUTTER POSITION. 83°c | 75°c | 8°c | Closed. 85 | 80 | 5 | " 89 | 85 | 4 | " Shutters begin to open 93 | 87 | 6 | Half open. 94 | 86 | 8 | 1/4 open. Fluctuating. 90/93/92 | 85 | 7 | " 85 | 78 | 7 | Half open. 86 | 76 | 9 | " 90 | 80 | 6 | " Fluctuating. 90/93/92 | 84 | 8 | " " 90 | 84 | 6 | " " 93 | 85 | 8 | " " 90 | 84 | 6 | " " Average 89°c. | 82°c. | 7°c. | 6. General conditions on road at about 30 m.p.h. Spring fitted. Air 18°c. WATER IN ENGINE | WATER IN RADIATOR. 82°c. | 74°c. 80 | 73 80 | 73 Average 80.6°c. | 73.3°c. Engine thermometert in standard position at rear of block. Radiator thermometer as close as was possible to thermostat. The fluctuating reading - 92/90/93 of engine thermometer occurred at the same place on the home banking on every lap in the tests in which it is indicated. There was no immediate explanation. | ||